Possible Clues:

• The cat turns and I turn, not wishing to talk
• With turn of the cat, it has tea in it for 28 across
• Jaguar reversing - I go quiet
• Quiet performance after act 1 went wrong
• Descriptive of the reserved Douglas Jardine, for example
• Perhaps I, cat, have little to give, in a manner of speaking (8)
• Much like Marcel Marceau
• Quiet diplomacy admits single vessel
• I act peculiarly and become reticent
• Seems that I, Cat, have little, in a manner of speaking